Strong torsion spring installation tool and method located in narrow space

Abstract

The invention belongs to the field of mechanical design and assembly, and particularly relates to a tool and method for installing a strong torsion spring in a narrow space. The powerful torsion spring installation tool comprises a support, a pressing rod, a pressing spring, an end cover, an upper handle, a bolt shaft, a rolling wheel, a sliding groove, a fastening screw, a fastening nut and a lower handle. The support is of a special-shaped structure, a lug piece is arranged at the upper end of the support, and a lug piece is arranged on the lug piece and used for being hinged to the upper handle. The other end of the support is provided with two fork-shaped structures, and through holes are formed in the fork-shaped structures and used for being hinged to the lower hook claw and the upper hook claw. The upper end of the support is provided with a recess, the recess is provided with a stepped through hole used for installing the pressing rod, and the position, close to the arc-shaped pressing block, of the lower end face is in precise clearance fit with the pressing rod, and it is guaranteed that the moving direction of the pressing rod is unchanged. A thread is arranged at the upper end of the stepped through hole of the bracket and is used for being matched with the thread of the end cover to limit the pressing rod; meanwhile, two tension spring hanging holes are drawn in the lower end of the support and used for hanging the tension spring.

Description

Technical Field

[0001] The invention belongs to the field of mechanical design and assembly, and in particular relates to a strong torsion spring installation tool and method in a narrow space. Background Art

[0002] The installation of torsion springs is often encountered in production and life. The installation of torsion springs in industrial products can be seen everywhere. For torsion springs with small size and small torque, they can generally be installed manually without the help of tools. However, for large torsion springs often encountered in production, it is difficult to install without the help of tools or external force. In addition, the labor intensity is very high during long-term installation, which causes great wear and damage to the hands, and the installation efficiency is not high. Especially when the installation space of strong torsion springs is limited, the operation is difficult or it is difficult to complete the installation work.

[0003] The present invention designs an installation tool for a very common torsion spring. The torsion spring material is 30CrMnSiA hot-rolled annealed, and the spring wire diameter is about 2.5mm. The characteristics of the spring of this material are high spring stiffness and high installation torque. Figure 1 The figure shows the installation position of the torsion spring. The space of the torsion spring installation slot is limited. The two sides of the torsion spring cannot be penetrated by relevant auxiliary tools. Only the front and rear directions of the torsion spring are assisted. After the torsion spring is changed to a large angle, the pin is passed through the lock and the installation hole of the torsion spring to complete the installation. The current installation method is that the operator manually presses the spring to deform it for installation, which has great disadvantages. When installing the spring, it is necessary to press the angle of the torsion spring on the matching part to change its angle by a large angle. Due to the large torque, the pin cannot be installed with one hand or one person. Repeated pressing is required to successfully pass the pin, and the installation efficiency is very low. In addition, when the number of deliveries is large at one time, the labor intensity of the workers is very high, and the pain in the hands is strong, which affects the progress. In order to solve the technical problems of the difficulty of installing the torsion spring, the small installation space and the low efficiency, it is necessary to design a tool specifically for the installation of this type of torsion spring. Summary of the invention

[0004] The technical problems to be solved by the present invention are:

[0005] The purpose of the present invention is to provide a strong torsion spring installation tool and method located in a narrow space to solve the above-mentioned problems existing in the prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A strong torsion spring installation tool located in a narrow space includes a bracket, a pressure rod, a compression spring, an end cover, an upper handle, a bolt shaft, a roller, a rotating shaft, a limit pin, an arc-shaped pressure block, a lower hook claw, an upper hook claw, an upper hook claw shaft, a lower hook claw shaft, a tension spring, a paddle, an L-shaped bayonet, a slide groove, a fastening screw, a fastening nut and a lower handle.

[0008] The bracket is a special-shaped structure, with an ear piece on the upper end, and an ear piece on the ear piece, which is used to be hinged with the upper handle; the other end of the bracket is provided with two fork-shaped structures, and the fork-shaped structure is provided with a through hole, which is used to be hinged with the lower hook claw and the upper hook claw; the upper end of the bracket is provided with a depression, and the depression is provided with a stepped hole for installing the pressure rod, and the lower end surface is close to the arc-shaped pressure block and the pressure rod is precisely matched with the clearance to ensure that the movement direction of the pressure rod remains unchanged. The upper end of the stepped hole of the bracket is provided with a thread, which is used to cooperate with the end cover thread to limit the pressure rod; at the same time, the lower end of the bracket is painted with two tension spring hanging holes for hanging the tension spring.

[0009] The pressure rod is a stepped shaft, one end of which penetrates into the stepped hole of the bracket. The compression spring is sleeved on the pressure rod. When the pressure rod is pressed down and the upper handle is released, the compression spring can return the pressure rod to its initial position.

[0010] The end cover is a stepped shell component, which is screwed together with the threaded through-hole of the stepped hole on the bracket to restrict the pressure rod and the compression spring in the hole to prevent them from jumping out; a through hole is provided in the center of the end cover to allow the pressure rod to pass through, while ensuring that the stepped platform of the pressure rod cannot pass through, thereby restricting its continued upward movement; a flat structure is provided at the upper end for clamping during screwing.

[0011] The upper handle is a rod-shaped component, and a through hole is provided at its end, which is concentrically matched with the ear piece on the bracket ear piece, and the rotating shaft passes through the through holes of the above two parts to form a revolving pair, so that the upper handle and the bracket can rotate relative to each other; a support is provided at the lower end of the handle 5, and a roller mounting hole is provided on the support; a screw hole is provided near the middle of the upper handle for fixing and installing the paddle; the bolt shaft passes through the through hole of the support and the center hole on the roller to form a revolving pair, so that the roller rotates during the clamping process, reducing the sliding resistance; the paddle is an arc-shaped toothed component, which is fixedly mounted on the threaded hole of the upper handle by a fastening screw.

[0012] The limit pin is a cylindrical component that penetrates into the hole of the rotating shaft to prevent the rotating shaft from jumping out during use.

[0013] The arc-shaped pressure block is an arc-shaped component, which is fixedly connected to the bottom of the pressure rod. The installation direction of the arc surface satisfies that the axis of the cylinder where the arc surface is located is parallel to the axis of the rotating shaft. The purpose is to make the arc surface fit with the outer side surface of the torsion spring installation hole to be installed during use to ensure firm clamping.

[0014] The lower hook and upper hook have the same structure but different sizes. One end is provided with a mounting hole, which is hinged with the hole at the end of the fork-shaped structure on the bracket through the upper hook shaft and the lower hook shaft to achieve relative rotation. The lower ends of the upper and lower hooks are provided with a hook-shaped structure, the purpose of which is to hook the upper and lower ends a and b of the torsion spring; the middle of the upper and lower hooks is provided with a tension spring mounting hole, and the two ends of the tension spring are respectively installed in the tension spring mounting holes of the bracket and the upper and lower hooks, so that when the upper and lower hooks are stuck at the ends a and b of the torsion spring, a slight restoring pressure is applied to prevent them from falling off.

[0015] The paddle is an arc-shaped component with teeth on the outer arc surface. One end is fixed to the bracket by a fastening screw, and the other end is in a free state. When the upper handle is pressed, the paddle rotates along the rotating shaft. When it rotates to an angle not less than the installation angle of the torsion spring, it pushes the L-shaped pin to slide in the slide groove. The pointed end of the L-shaped pin penetrates into the teeth of the paddle, limiting the rebound of the upper handle and maintaining the opening angle of the torsion spring.

[0016] The slide groove is a concave component, which is fixedly installed on the side of the upper handle.

[0017] The lower handle is a rod-shaped arc-shaped component, and when the upper handle is pressed down, a reaction force is generated on the hand.

[0018] A strong torsion spring installation tool located in a narrow space comprises a bracket, a pressure rod, a compression spring, an end cover, an upper handle, a bolt shaft, a roller, a rotating shaft, a limit pin, an arc-shaped pressure block, a lower hook claw, an upper hook claw, an upper hook claw shaft, a lower hook claw shaft, a tension spring, a paddle, an L-shaped bayonet, a slide groove, a fastening screw, a fastening nut, and a lower handle.

[0019] The specific contents are as follows: Figure 1 The figure is a schematic diagram of the structure of the torsion spring to be installed. The material and state of the torsion spring are 30CrMnSiA hot-rolled annealed. The characteristics of the torsion spring are large stiffness and large torque. The upper end is a, the lower end is b, and a mounting hole c is formed in the middle.

[0020] The steps to use are as follows:

[0021] Install the torsion spring as follows Figure 4 At this time, the tension of the tension spring is manually overcome, and the stiffness requirement of the tension spring is small. The relative angle of the lower hook claw and the upper hook claw is opened, and the end a of the torsion spring is clamped on the upper hook claw, and the end b is clamped on the lower hook 11. The upper handle is pressed to rotate it around the rotation axis toward the lower handle. The roller acts on the upper end surface of the pressure rod, and the pressure rod moves downward to bring the arc-shaped pressure block close to the outer arc surface of the installation hole c of the torsion spring. The upper handle is continued to be pressed to make the pressure rod continue to apply pressure to the torsion spring, so that the angle of the torsion spring is opened, and the ends a and b of the torsion spring are opened, so that the upper hook claw and the lower hook claw are prompted to rotate around the hook claw axis 13 and the lower hook claw axis.

[0022] When the torsion spring is opened to a degree not less than the installation angle of the torsion spring, the torsion spring is placed in the assembly position through the device. At this time, the central axis of the torsion spring can be easily passed through the locking and installation hole to achieve the installation of the torsion spring.

[0023] After the torsion spring is installed, the lower hook and the upper hook are manually moved to open their relative angles so that they are separated from the two ends of the torsion spring, and the device is disassembled. The torsion spring is firmly fixed at the position to be installed by the restoring force.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. High assembly efficiency. Using this device to install torsion springs in a narrow space not only reduces the labor intensity of workers, but also greatly improves assembly efficiency, making it suitable for mass production.

[0026] 2. Simple production and low maintenance cost. The device has a small number of parts and can be made of common metal materials, with low production cost and subsequent maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the installed torsion spring structure;

[0028] Figure 2 The figure is a schematic diagram of the installation position and status of the torsion spring;

[0029] Figure 3 It is a structural schematic diagram of the torsion spring installation device (partial section);

[0030] Figure 4 is a three-dimensional diagram of a torsion spring mounting device;

[0031] Figure 5 It is a schematic diagram of the structure after the torsion spring is clamped;

[0032] Figure 6 Schematic diagram of the support structure.

[0033] In the figure: 1- bracket, 2- pressure rod, 3- compression spring, 4- end cover, 5- upper handle, 6- bolt shaft, 7- roller, 8- rotating shaft, 9- limit pin, 10- arc pressure block, 11- lower hook claw, 12- upper hook claw, 13- upper hook claw shaft, 14- lower hook claw shaft, 15- tension spring, 16- paddle, 17- L-shaped bayonet, 18- slide groove, 19- fastening screw, 20- fastening nut, lower handle 21, a- upper end of torsion spring, b- lower end of torsion spring; c- mounting hole of torsion spring; d- lock, e- pin. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0035] It should be understood that the attached drawings are not drawn to scale, but are merely simplified drawings of various features for illustrating the basic principles of the present invention. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, directions, positions, and shapes, will be determined in part by the specific intended application and use environment. In the attached multiple drawings, the same or equivalent components are labeled with the same reference numerals.

[0036] Embodiment 1:

[0037] A strong torsion spring installation tool located in a narrow space includes a bracket 1, a pressure rod 2, a compression spring 3, an end cover 4, an upper handle 5, a bolt shaft 6, a roller 7, a rotating shaft 8, a limit pin 9, an arc-shaped pressure block 10, a lower hook claw 11, an upper hook claw 12, an upper hook claw shaft 13, a lower hook claw shaft 14, a tension spring 15, a paddle 16, an L-shaped latch 17, a slide groove 18, a fastening screw 19, a fastening nut 20 and a lower handle 21.

[0038] The bracket 1 is a special-shaped structure, with an ear piece 1-1 at its upper end, and an ear piece 1-2 on the ear piece, which is used to be hinged with the upper handle 5; the other end of the bracket 1 is provided with two fork-shaped structures 1-3, and the fork-shaped structures are provided with through holes, which are used to be hinged with the lower hook claw 11 and the upper hook claw 12; the upper end of the bracket 1 is provided with a depression 1-4, and the depression is provided with a stepped hole 1-5, which is used to install the pressure rod 2, and the lower end surface is close to the arc-shaped pressure block 10 and the pressure rod 2 is precisely matched with the clearance to ensure that the movement direction of the pressure rod 2 remains unchanged. The upper end of the stepped hole 1-5 of the bracket 1 is provided with a thread, which is used to cooperate with the thread of the end cover 4 to limit the pressure rod 2; at the same time, the lower end of the bracket 1 is painted with two tension spring hanging holes 1-6 for hanging the tension spring 15.

[0039] The pressure rod 2 is a stepped shaft, one end of which penetrates into the stepped hole 1-5 of the bracket 1. The compression spring 3 is sleeved on the pressure rod 2. When the pressure rod 2 is pressed down and the upper handle 5 is released, the compression spring 3 can return the pressure rod 2 to its initial position.

[0040] The end cover 4 is a stepped shell component, which is threadedly matched with the stepped holes 1-5 on the bracket 1 to restrict the pressure rod 2 and the compression spring 3 in the hole to prevent them from jumping out; a through hole is provided in the center of the end cover 4 to allow the pressure rod 2 to pass through, while ensuring that the stepped platform of the pressure rod 2 cannot pass through, thereby restricting its continued upward movement; a flat structure is provided at the upper end for clamping during screwing.

[0041] The upper handle 5 is a rod-shaped component, and a through hole is provided at its end, which is concentrically matched with the ear piece 1-2 on the ear piece of the bracket 1, and the rotating shaft 8 passes through the through holes of the above two parts to form a revolving pair, so that the upper handle 5 and the bracket 1 can rotate relative to each other; a support is provided at the lower end of the handle 5, and a roller mounting hole is provided on the support; a screw hole is provided near the middle of the upper handle 5 for fixing and installing the paddle 16; the bolt shaft 6 passes through the through hole of the support and the center hole on the roller 7 to form a revolving pair, so that the roller 7 rotates during the pressing process, reducing the sliding resistance; the paddle 16 is an arc-shaped toothed component, which is fixedly mounted on the threaded hole of the upper handle 5 by a fastening screw.

[0042] The limit pin 9 is a cylindrical member, which penetrates into the hole of the rotating shaft 8 to prevent the rotating shaft 8 from jumping out during use.

[0043] The arc-shaped pressure block 10 is an arc-shaped component, which is fixedly connected to the bottom of the pressure rod 2. The installation direction of the arc surface satisfies that the axis of the cylinder where the arc surface is located is parallel to the axis of the rotating shaft 8. The purpose is to make the arc surface fit with the outer side surface of the torsion spring installation hole to be installed during use to ensure firm clamping.

[0044] The lower hook 11 and the upper hook 12 have the same structure but different sizes. One end is provided with a mounting hole, which is hinged with the hole at the end of the fork-shaped structure 1-3 on the bracket 1 through the upper hook shaft 13 and the lower hook shaft 14 to achieve relative rotation. The lower ends of the upper and lower hooks are provided with a hook-shaped structure, the purpose of which is to hook the upper and lower ends a and b of the torsion spring; the middle of the upper and lower hooks is provided with a tension spring mounting hole, and the two ends of the tension spring 15 are respectively installed in the tension spring mounting holes of the bracket 1 and the upper and lower hooks, so that when the upper and lower hooks are stuck at the ends a and b of the torsion spring, a slight restoring pressure is applied to prevent them from falling off.

[0045] The paddle 16 is an arc-shaped component with teeth on its outer arc surface. One end is fixed to the bracket 1 by a fastening screw, and the other end is in a free state. When the upper handle 5 is pressed, the paddle 16 rotates along the rotating shaft 8. When it rotates to an angle not less than the installation angle of the torsion spring, it pushes the L-shaped pin 17 to slide in the slide groove 18. The pointed end of the L-shaped pin 17 penetrates into the teeth of the paddle 16, limiting the rebound of the upper handle 5 and maintaining the opening angle of the torsion spring.

[0046] The slide groove 18 is a concave component, which is fixedly installed on the side of the upper handle 5.

[0047] The lower handle 21 is a rod-shaped arc-shaped component, which generates a reaction force on the hand when the upper handle 5 is pressed down.

[0048] Embodiment 2:

[0049] A strong torsion spring installation tool located in a narrow space includes a bracket 1, a pressure rod 2, a compression spring 3, an end cover 4, an upper handle 5, a bolt shaft 6, a roller 7, a rotating shaft 8, a limit pin 9, an arc-shaped pressure block 10, a lower hook claw 11, an upper hook claw 12, an upper hook claw shaft 13, a lower hook claw shaft 14, a tension spring 15, a paddle 16, an L-shaped latch 17, a slide groove 18, a fastening screw 19, a fastening nut 20, and a lower handle 21.

[0050] The specific contents are as follows: Figure 1 The figure is a schematic diagram of the structure of the torsion spring to be installed. The material and state of the torsion spring are 30CrMnSiA hot-rolled annealed. The characteristics of the torsion spring are large stiffness and large torque. The upper end is a, the lower end is b, and a mounting hole c is formed in the middle.

[0051] The steps to use are as follows:

[0052] 1. Install the torsion spring as follows Figure 4 At this time, the tension of the tension spring 15 is manually overcome, and the stiffness requirement of the tension spring 15 is small. The lower hook claw 11 and the upper hook claw 12 are opened relative to each other, and the end a of the torsion spring is clamped on the upper hook claw 12, and the end b is clamped on the lower hook 11. The upper handle 5 is pressed to rotate it around the rotating shaft 8 toward the lower handle 21. The roller 7 acts on the upper end surface of the pressure rod 2, and the pressure rod 2 moves downward to bring the arc-shaped pressure block 10 close to the outer arc surface of the installation hole c of the torsion spring. The upper handle 5 is continuously pressed to make the pressure rod 2 continue to apply pressure to the torsion spring, so that the angle of the torsion spring is opened, and the ends a and b of the torsion spring are opened, so that the upper hook claw 12 and the lower hook claw 11 are prompted to rotate around the hook claw axis 13 and the lower hook claw axis 14.

[0053] 2 When the torsion spring is opened to a position not less than the installation angle of the torsion spring, the torsion spring is placed in the assembly position through the device. At this time, the center axis of the torsion spring can be easily passed through the lock and the installation hole to realize the installation of the torsion spring.

[0054] After the torsion spring is installed, the lower hook 11 and the upper hook 12 are manually moved to open their relative angles so that they are separated from the two ends of the torsion spring, and the device is disassembled. The torsion spring is firmly fixed at the position to be installed by the restoring force.

Claims

1. A powerful torsion spring installation tool in a narrow space, characterized in that: The utility model comprises a bracket (1), a pressure rod (2), a pressure spring (3), an end cover (4), an upper handle (5), a bolt shaft (6), a roller (7), a rotating shaft (8), a limit pin (9), an arc-shaped pressure block (10), a lower hook claw (11), an upper hook claw (12), an upper hook claw shaft (13), a lower hook claw shaft (14), a tension spring (15), a paddle (16), an L-shaped bayonet (17), a slide groove (18), a fastening screw (19), a fastening nut (20) and a lower handle (21); The bracket (1) is a special-shaped structure, and an ear piece (1-1) is provided at its upper end, and an ear piece (1-2) is provided on the ear piece for hinged connection with the upper handle (5); the other end of the bracket (1) is provided with two fork-shaped structures (1-3), and a through hole is provided on the fork-shaped structure for hinged connection with the lower hook claw (11) and the upper hook claw (12); a depression (1-4) is provided at the upper end of the bracket (1), and a stepped hole (1-5) is provided on the depression for installing the pressure rod (2), and the lower end surface is close to the arc-shaped pressure block (10) and the pressure rod (2) is precisely matched with the clearance to ensure that the movement direction of the pressure rod (2) remains unchanged; the upper end of the stepped hole (1-5) of the bracket (1) is provided with a thread for matching with the thread of the end cover (4) to limit the pressure rod (2); at the same time, the lower end of the bracket (1) is painted with two tension spring hanging holes (1-6) for hanging the tension spring (15); The pressure rod (2) is a stepped shaft, one end of which is inserted into the stepped hole (1-5) of the bracket (1). The compression spring (3) is sleeved on the pressure rod (2). When the pressure rod (2) is pressed down and the upper handle (5) is released, the compression spring (3) can return the pressure rod (2) to its initial position. The end cover (4) is a stepped shell component, which is threadedly matched with the stepped hole (1-5) on the bracket (1) to restrict the pressure rod (2) and the compression spring (3) in the hole to prevent them from jumping out; a through hole is provided in the center of the end cover (4) to allow the pressure rod (2) to pass through, while ensuring that the stepped platform of the pressure rod (2) cannot pass through, thereby restricting its continued upward movement; a flat structure is provided at the upper end for clamping during screwing; The upper handle (5) is a rod-shaped component, and a through hole is provided at its end, and the through hole is coaxially matched with the ear piece (1-2) on the ear piece of the bracket (1). The rotating shaft (8) passes through the through holes of the above two parts to form a rotating pair, so that the upper handle (5) and the bracket (1) can rotate relative to each other; a support is provided at the lower end of the handle 5, and a roller mounting hole is provided on the support; a screw hole is provided near the middle of the upper handle (5) for fixing and installing the paddle (16); the bolt shaft (6) passes through the through hole of the support and the center hole on the roller (7) to form a rotating pair, so that the roller (7) rotates during the pressing process, reducing the sliding resistance; the paddle (16) is an arc-shaped toothed component, which is fixedly installed on the threaded hole of the upper handle (5) by a fastening screw; the slide groove (18) is a concave component, which is fixedly installed on the side of the upper handle (5); The lower handle (21) is a rod-shaped arc-shaped component, which generates a reaction force on the hand when the upper handle (5) is pressed down.

2. A strong torsion spring installation tool in a narrow space as claimed in claim 1, characterized in that: The stop pin (9) is a cylindrical component which penetrates into the hole of the rotating shaft (8) to prevent the rotating shaft (8) from jumping out during use.

3. A strong torsion spring installation tool in a narrow space as claimed in claim 1 or 2, characterized in that: The arc-shaped pressure block (10) is an arc-shaped component, which is fixedly connected to the bottom of the pressure rod (2). The installation direction of the arc surface satisfies that the axis of the cylinder where the arc surface is located is parallel to the axis of the rotating shaft (8). The purpose is to make the arc surface fit with the outer side surface of the installation hole of the torsion spring to be installed during use to ensure firm clamping.

4. A strong torsion spring installation tool in a narrow space as claimed in claim 1 or 2, characterized in that: The lower hook claw (11) and the upper hook claw (12) have the same structure but different sizes. One end is provided with a mounting hole, which is hinged with the hole at the end of the fork-shaped structure (1-3) on the bracket (1) through the upper hook claw shaft (13) and the lower hook claw shaft (14) to achieve relative rotation; a tension spring mounting hole is provided in the middle of the upper and lower hook claws, and the two ends of the tension spring (15) are respectively installed in the tension spring mounting holes of the bracket (1) and the upper and lower hook claws, so that when the upper and lower hook claws are stuck at the a and b ends of the torsion spring, a small restoring pressure is applied to prevent them from falling off.

5. A strong torsion spring installation tool in a narrow space as claimed in claim 3, characterized in that: The lower hook claw (11) and the upper hook claw (12) have the same structure but different sizes. One end is provided with a mounting hole, which is hinged with the hole at the end of the fork-shaped structure (1-3) on the bracket (1) through the upper hook claw shaft (13) and the lower hook claw shaft (14) to achieve relative rotation; a tension spring mounting hole is provided in the middle of the upper and lower hook claws, and the two ends of the tension spring (15) are respectively installed in the tension spring mounting holes of the bracket (1) and the upper and lower hook claws, so that when the upper and lower hook claws are stuck at the a and b ends of the torsion spring, a small restoring pressure is applied to prevent them from falling off.

6. A strong torsion spring installation tool in a narrow space as claimed in claim 1, 2 or 5, characterized in that: The paddle (16) is an arc-shaped component, with teeth arranged on the outer arc surface, one end of which is fixed to the bracket (1) by a fastening screw, and the other end is in a free state. When the upper handle (5) is pressed, the paddle (16) rotates along the rotating shaft (8), and when it rotates to an angle not less than the installation angle of the torsion spring, it pushes the L-shaped bayonet (17) to slide in the slide groove (18), and the spike end of the L-shaped bayonet (17) penetrates into the teeth of the paddle (16), restricting the rebound of the upper handle (5), so that the opening angle of the torsion spring is maintained.

7. A strong torsion spring installation tool in a narrow space as claimed in claim 3, characterized in that: The paddle (16) is an arc-shaped component, with teeth arranged on the outer arc surface, one end of which is fixed to the bracket (1) by a fastening screw, and the other end is in a free state. When the upper handle (5) is pressed, the paddle (16) rotates along the rotating shaft (8), and when it rotates to an angle not less than the installation angle of the torsion spring, it pushes the L-shaped bayonet (17) to slide in the slide groove (18), and the spike end of the L-shaped bayonet (17) penetrates into the teeth of the paddle (16), restricting the rebound of the upper handle (5), so that the opening angle of the torsion spring is maintained.

8. A strong torsion spring installation tool in a narrow space as claimed in claim 4, characterized in that: The paddle (16) is an arc-shaped component, with teeth arranged on the outer arc surface, one end of which is fixed to the bracket (1) by a fastening screw, and the other end is in a free state. When the upper handle (5) is pressed, the paddle (16) rotates along the rotating shaft (8), and when it rotates to an angle not less than the installation angle of the torsion spring, it pushes the L-shaped bayonet (17) to slide in the slide groove (18), and the spike end of the L-shaped bayonet (17) penetrates into the teeth of the paddle (16), restricting the rebound of the upper handle (5), so that the opening angle of the torsion spring is maintained.

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